// Copyright (c) 2014-2016 The Dash developers
// Copyright (c) 2015-2017 The PIVX developers
// Copyright (c) 2018-2019 The esbcoin Core developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "activemasternode.h"

#include "addrman.h"
#include "masternode.h"
#include "masternodeconfig.h"
#include "masternodeman.h"
#include "protocol.h"
#include "spork.h"

void CActiveMasternode::ManageStatus()
{
    std::string errorMessage;

    if (!fMasterNode)
        return;

    if (fDebug)
        LogPrintf("CActiveMasternode::ManageStatus() - Begin\n");

    //need correct blocks to send ping
    if (Params().NetworkID() != CBaseChainParams::REGTEST && !masternodeSync.IsBlockchainSynced()) {
        status = ACTIVE_MASTERNODE_SYNC_IN_PROCESS;
        LogPrintf("CActiveMasternode::ManageStatus() - %s\n", GetStatus());
        return;
    }

    if (status == ACTIVE_MASTERNODE_SYNC_IN_PROCESS)
        status = ACTIVE_MASTERNODE_INITIAL;

    if (status == ACTIVE_MASTERNODE_INITIAL) {
        CMasternode* pmn;
        pmn = mnodeman.Find(pubKeyMasternode);
        if (pmn != NULL) {
            pmn->Check();
            if (pmn->IsEnabled() && pmn->protocolVersion >= ActiveProtocol())
                EnableHotColdMasterNode(pmn->vin, pmn->addr);
        }
    }

    if (status != ACTIVE_MASTERNODE_STARTED) {
        // Set defaults
        status = ACTIVE_MASTERNODE_NOT_CAPABLE;
        notCapableReason = "";

        if (pwalletMain->IsLocked()) {
            notCapableReason = "Wallet is locked.";
            LogPrintf("CActiveMasternode::ManageStatus() - not capable: %s\n", notCapableReason);
            return;
        }

        if (pwalletMain->GetBalance() == 0) {
            notCapableReason = "Hot node, waiting for remote activation.";
            LogPrintf("CActiveMasternode::ManageStatus() - not capable: %s\n", notCapableReason);
            return;
        }

        if (strMasterNodeAddr.empty()) {
            if (!GetLocal(service)) {
                notCapableReason = "Can't detect external address. Please use the masternodeaddr configuration option.";
                LogPrintf("CActiveMasternode::ManageStatus() - not capable: %s\n", notCapableReason);
                return;
            }
        } else {
            service = CService(strMasterNodeAddr);
        }

        // The service needs the correct default port to work properly
        if(!CMasternodeBroadcast::CheckDefaultPort(strMasterNodeAddr, errorMessage, "CActiveMasternode::ManageStatus()"))
            return;

        LogPrintf("CActiveMasternode::ManageStatus() - Checking inbound connection to '%s'\n", service.ToString());

        CNode* pnode = ConnectNode((CAddress)service, NULL, false);
        if (!pnode) {
            notCapableReason = "Could not connect to " + service.ToString();
            LogPrintf("CActiveMasternode::ManageStatus() - not capable: %s\n", notCapableReason);
            return;
        }
        pnode->Release();

        // Choose coins to use
        CPubKey pubKeyCollateralAddress;
        CKey keyCollateralAddress;

        if (GetMasterNodeVin(vin, pubKeyCollateralAddress, keyCollateralAddress)) {
            if (GetInputAge(vin) < MASTERNODE_MIN_CONFIRMATIONS) {
                status = ACTIVE_MASTERNODE_INPUT_TOO_NEW;
                notCapableReason = strprintf("%s - %d confirmations", GetStatus(), GetInputAge(vin));
                LogPrintf("CActiveMasternode::ManageStatus() - %s\n", notCapableReason);
                return;
            }

            LOCK(pwalletMain->cs_wallet);
            pwalletMain->LockCoin(vin.prevout);

            // send to all nodes
            CPubKey pubKeyMasternode;
            CKey keyMasternode;

            if (!obfuScationSigner.SetKey(strMasterNodePrivKey, errorMessage, keyMasternode, pubKeyMasternode)) {
                notCapableReason = "Error upon calling SetKey: " + errorMessage;
                LogPrintf("Register::ManageStatus() - %s\n", notCapableReason);
                return;
            }

            if (!Register(vin, service, keyCollateralAddress, pubKeyCollateralAddress, keyMasternode, pubKeyMasternode, errorMessage)) {
                notCapableReason = "Error on Register: " + errorMessage;
                LogPrintf("Register::ManageStatus() - %s\n", notCapableReason);
                return;
            }

            LogPrintf("CActiveMasternode::ManageStatus() - Is capable master node!\n");
            status = ACTIVE_MASTERNODE_STARTED;

            return;
        } else {
            notCapableReason = "Could not find suitable coins!";
            LogPrintf("CActiveMasternode::ManageStatus() - %s\n", notCapableReason);
            return;
        }
    }

    //send to all peers
    if (!SendMasternodePing(errorMessage)) {
        LogPrintf("CActiveMasternode::ManageStatus() - Error on Ping: %s\n", errorMessage);
    }
}

std::string CActiveMasternode::GetStatus()
{
    switch (status) {
    case ACTIVE_MASTERNODE_INITIAL:
        return "Node just started, not yet activated";
    case ACTIVE_MASTERNODE_SYNC_IN_PROCESS:
        return "Sync in progress. Must wait until sync is complete to start Masternode";
    case ACTIVE_MASTERNODE_INPUT_TOO_NEW:
        return strprintf("Masternode input must have at least %d confirmations", MASTERNODE_MIN_CONFIRMATIONS);
    case ACTIVE_MASTERNODE_NOT_CAPABLE:
        return "Not capable masternode: " + notCapableReason;
    case ACTIVE_MASTERNODE_STARTED:
        return "Masternode successfully started";
    default:
        return "unknown";
    }
}

bool CActiveMasternode::SendMasternodePing(std::string& errorMessage)
{
    if (status != ACTIVE_MASTERNODE_STARTED) {
        errorMessage = "Masternode is not in a running status";
        return false;
    }

    CPubKey pubKeyMasternode;
    CKey keyMasternode;

    if (!obfuScationSigner.SetKey(strMasterNodePrivKey, errorMessage, keyMasternode, pubKeyMasternode)) {
        errorMessage = strprintf("Error upon calling SetKey: %s\n", errorMessage);
        return false;
    }

    LogPrintf("CActiveMasternode::SendMasternodePing() - Relay Masternode Ping vin = %s\n", vin.ToString());

    CMasternodePing mnp(vin);
    if (!mnp.Sign(keyMasternode, pubKeyMasternode)) {
        errorMessage = "Couldn't sign Masternode Ping";
        return false;
    }

    // Update lastPing for our masternode in Masternode list
    CMasternode* pmn = mnodeman.Find(vin);
    if (pmn != NULL) {
        if (pmn->IsPingedWithin((ActiveProtocol() >= CONSENSUS_FORK_PROTO) ? MASTERNODE_PING_SECONDS2 : MASTERNODE_PING_SECONDS, mnp.sigTime)) {
            errorMessage = "Too early to send Masternode Ping";
            return false;
        }

        pmn->lastPing = mnp;
        mnodeman.mapSeenMasternodePing.insert(make_pair(mnp.GetHash(), mnp));

        //mnodeman.mapSeenMasternodeBroadcast.lastPing is probably outdated, so we'll update it
        CMasternodeBroadcast mnb(*pmn);
        uint256 hash = mnb.GetHash();
        if (mnodeman.mapSeenMasternodeBroadcast.count(hash)) mnodeman.mapSeenMasternodeBroadcast[hash].lastPing = mnp;

        mnp.Relay();

        return true;
    } else {
        // Seems like we are trying to send a ping while the Masternode is not registered in the network
        errorMessage = "Obfuscation Masternode List doesn't include our Masternode, shutting down Masternode pinging service! " + vin.ToString();
        status = ACTIVE_MASTERNODE_NOT_CAPABLE;
        notCapableReason = errorMessage;
        return false;
    }
}

bool CActiveMasternode::Register(std::string strService, std::string strKeyMasternode, std::string strTxHash, std::string strOutputIndex, std::string& errorMessage)
{
    CTxIn vin;
    CPubKey pubKeyCollateralAddress;
    CKey keyCollateralAddress;
    CPubKey pubKeyMasternode;
    CKey keyMasternode;

    //need correct blocks to send ping
    if (!masternodeSync.IsBlockchainSynced()) {
        errorMessage = GetStatus();
        LogPrintf("CActiveMasternode::Register() - %s\n", errorMessage);
        return false;
    }

    if (!obfuScationSigner.SetKey(strKeyMasternode, errorMessage, keyMasternode, pubKeyMasternode)) {
        errorMessage = strprintf("Can't find keys for masternode %s - %s", strService, errorMessage);
        LogPrintf("CActiveMasternode::Register() - %s\n", errorMessage);
        return false;
    }

    if (!GetMasterNodeVin(vin, pubKeyCollateralAddress, keyCollateralAddress, strTxHash, strOutputIndex)) {
        errorMessage = strprintf("Could not allocate vin %s:%s for masternode %s", strTxHash, strOutputIndex, strService);
        LogPrintf("CActiveMasternode::Register() - %s\n", errorMessage);
        return false;
    }

    // The service needs the correct default port to work properly
    if(!CMasternodeBroadcast::CheckDefaultPort(strService, errorMessage, "CActiveMasternode::Register()"))
        return false;

    auto service = CService{strService};

    if(!Register(vin, service, keyCollateralAddress, pubKeyCollateralAddress, keyMasternode, pubKeyMasternode, errorMessage))
        return false;

    addrman.Add(CAddress{service}, CNetAddr{"127.0.0.1"}, 2 * 60 * 60);

    return true;
}

bool CActiveMasternode::Register(CTxIn vin, CService service, CKey keyCollateralAddress, CPubKey pubKeyCollateralAddress, CKey keyMasternode, CPubKey pubKeyMasternode, std::string& errorMessage)
{
    auto mnode = mnodeman.Find(service);

    if(mnode && mnode->vin != vin)
    {
        errorMessage = strprintf("Duplicate Masternode address: %s", service.ToString());
        LogPrintf("CActiveMasternode::Register() -  %s\n", errorMessage);
        return false;
    }

    CMasternodePing mnp(vin);
    if (!mnp.Sign(keyMasternode, pubKeyMasternode)) {
        errorMessage = strprintf("Failed to sign ping, vin: %s", vin.ToString());
        LogPrintf("CActiveMasternode::Register() -  %s\n", errorMessage);
        return false;
    }
    mnodeman.mapSeenMasternodePing.insert(make_pair(mnp.GetHash(), mnp));

    LogPrintf("CActiveMasternode::Register() - Adding to Masternode list\n    service: %s\n    vin: %s\n", service.ToString(), vin.ToString());
    CMasternodeBroadcast mnb(service, vin, pubKeyCollateralAddress, pubKeyMasternode, PROTOCOL_VERSION);
    mnb.lastPing = mnp;
    if (!mnb.Sign(keyCollateralAddress)) {
        errorMessage = strprintf("Failed to sign broadcast, vin: %s", vin.ToString());
        LogPrintf("CActiveMasternode::Register() - %s\n", errorMessage);
        return false;
    }
    mnodeman.mapSeenMasternodeBroadcast.insert(make_pair(mnb.GetHash(), mnb));
    masternodeSync.AddedMasternodeList(mnb.GetHash());

    CMasternode* pmn = mnodeman.Find(vin);
    if (!pmn) {
        CMasternode mn(mnb);
        mnodeman.Add(mn);
    } else {
        pmn->UpdateFromNewBroadcast(mnb);
    }

    //send to all peers
    LogPrintf("CActiveMasternode::Register() - RelayElectionEntry vin = %s\n", vin.ToString());
    mnb.Relay();

    return true;
}

bool CActiveMasternode::GetMasterNodeVin(CTxIn& vin, CPubKey& pubkey, CKey& secretKey)
{
    return GetMasterNodeVin(vin, pubkey, secretKey, "", "");
}

bool CActiveMasternode::GetMasterNodeVin(CTxIn& vin, CPubKey& pubkey, CKey& secretKey, std::string strTxHash, std::string strOutputIndex)
{
    // Find possible candidates
    TRY_LOCK(pwalletMain->cs_wallet, fWallet);
    if (!fWallet) return false;

    vector<COutput> possibleCoins = SelectCoinsMasternode();

    COutput* selectedOutput = nullptr;

    // Find the vin
    if (!strTxHash.empty()) {
        // Let's find it
        uint256 txHash(strTxHash);
        int outputIndex;
        try {
            outputIndex = std::stoi(strOutputIndex.c_str());
        } catch (const std::exception& e) {
            LogPrintf("%s: %s on strOutputIndex\n", __func__, e.what());
            return false;
        }

        BOOST_FOREACH (COutput& out, possibleCoins) {

            if(out.tx->GetHash() != txHash || out.i != outputIndex)
                continue;

            if(!CMasternode::Level(out.tx->vout[out.i].nValue, chainActive.Height()))
                continue;

            selectedOutput = &out;
            break;
        }

        if (!selectedOutput) {
            LogPrintf("CActiveMasternode::GetMasterNodeVin - Could not locate valid vin\n");
            return false;
        }
    } else {
        // No output specified, Select the first one with higheset level
        if (!possibleCoins.size()) {
            LogPrintf("CActiveMasternode::GetMasterNodeVin - Could not locate specified vin from possible list\n");
            return false;
        }

        selectedOutput = &possibleCoins[0];

        auto selected_level = CMasternode::Level(selectedOutput->tx->vout[selectedOutput->i].nValue, chainActive.Height());

        for(auto& out : possibleCoins) {

            if(selected_level == 3u)
                break;

            if(CMasternode::Level(out.tx->vout[out.i].nValue, chainActive.Height()) > selected_level)
                selectedOutput = &out;
        }
    }

    // At this point we have a selected output, retrieve the associated info
    return GetVinFromOutput(*selectedOutput, vin, pubkey, secretKey);
}

// Extract Masternode vin information from output
bool CActiveMasternode::GetVinFromOutput(COutput out, CTxIn& vin, CPubKey& pubkey, CKey& secretKey)
{
    CScript pubScript;

    vin = CTxIn(out.tx->GetHash(), out.i);
    pubScript = out.tx->vout[out.i].scriptPubKey; // the inputs PubKey

    CTxDestination address1;
    ExtractDestination(pubScript, address1);
    CBitcoinAddress address2(address1);

    CKeyID keyID;
    if (!address2.GetKeyID(keyID)) {
        LogPrintf("CActiveMasternode::GetMasterNodeVin - Address does not refer to a key\n");
        return false;
    }

    if (!pwalletMain->GetKey(keyID, secretKey)) {
        LogPrintf("CActiveMasternode::GetMasterNodeVin - Private key for address is not known\n");
        return false;
    }

    pubkey = secretKey.GetPubKey();
    return true;
}

// get all possible outputs for running Masternode
vector<COutput> CActiveMasternode::SelectCoinsMasternode()
{
    vector<COutput> vCoins;
    vector<COutput> filteredCoins;
    vector<COutPoint> confLockedCoins;

    // Temporary unlock MN coins from masternode.conf
    if (GetBoolArg("-mnconflock", true)) {
        uint256 mnTxHash;
        BOOST_FOREACH (CMasternodeConfig::CMasternodeEntry mne, masternodeConfig.getEntries()) {
            mnTxHash.SetHex(mne.getTxHash());

            int nIndex;
            if (!mne.castOutputIndex(nIndex))
                continue;

            COutPoint outpoint = COutPoint(mnTxHash, nIndex);
            confLockedCoins.push_back(outpoint);
            pwalletMain->UnlockCoin(outpoint);
        }
    }

    // Retrieve all possible outputs
    pwalletMain->AvailableCoins(vCoins);

    // Lock MN coins from masternode.conf back if they where temporary unlocked
    if (!confLockedCoins.empty()) {
        BOOST_FOREACH (COutPoint outpoint, confLockedCoins)
            pwalletMain->LockCoin(outpoint);
    }

    // Filter
    BOOST_FOREACH (const COutput& out, vCoins) {

        if(CMasternode::IsDepositCoins(out.tx->vout[out.i].nValue))
            filteredCoins.push_back(out);
    }

    return filteredCoins;
}

// when starting a Masternode, this can enable to run as a hot wallet with no funds
bool CActiveMasternode::EnableHotColdMasterNode(CTxIn& newVin, CService& newService)
{
    if (!fMasterNode)
        return false;

    status = ACTIVE_MASTERNODE_STARTED;

    //The values below are needed for signing mnping messages going forward
    vin = newVin;
    service = newService;

    LogPrintf("CActiveMasternode::EnableHotColdMasterNode() - Enabled! You may shut down the cold daemon.\n");

    return true;
}
